Equine veterinary journal1994; 26(6); 482-485; doi: 10.1111/j.2042-3306.1994.tb04054.x

A survey of exercise-induced pulmonary haemorrhage in Quebec standardbred racehorses.

Abstract: Sixty Standardbred horses, aged 3 to 10 years, were examined endoscopically for exercise-induced pulmonary haemorrhage (EIPH) 1 h after racing, on at least 3 occasions. Racing time, finishing position and post exercise venous lactate concentrations were also recorded. Horses positive for tracheal blood on endoscopy were classified as having either grade 1 EIPH (one or a few spots of blood in the trachea), or grade 2 (stream of blood). Air temperature, relative humidity and air pollutant levels were recorded on each examination day. Of the 60 horses, 52 (87%) were EIPH-positive on at least one evaluation out of 3 and 40 of the 52 (77%) showed grade 2 EIPH on at least one occasion. Of the 52 EIPH-positive horses, 52% bled 3 times out of 3, 21% 2 out of 3 and 27% once. When only the first examination was considered, 37 of the 60 horses (62%) were EIPH-positive. There was no significant relation detected between either presence or frequency of EIPH and age, sex, or gait. Horses that showed grade 2 EIPH bled significantly (P = < 0.001) more frequently (mean: 83% of examinations) than horses having shown no more than grade 1 EIPH (47% of examinations). No significant differences could be detected between EIPH-positive and EIPH-negative races in the average racing times, finishing positions and blood lactate concentrations of the 29 horses which showed intermittent EIPH. The proportion of horses showing EIPH on each day where at least 5 horses were examined was correlated with air temperature, relative humidity, and the levels of several air pollutants on those days.(ABSTRACT TRUNCATED AT 250 WORDS)
Publication Date: 1994-11-01 PubMed ID: 7889923DOI: 10.1111/j.2042-3306.1994.tb04054.xGoogle Scholar: Lookup
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The research examined the occurrence of exercise-induced pulmonary haemorrhage (EIPH) in racehorses in Quebec. The findings showed that the majority of horses were affected by EIPH, and the condition was present more often in horses with grade 2 EIPH.

Objective and Methodology

  • The primary aim of this study was to explore the occurrence and frequency of exercise-induced pulmonary haemorrhage (EIPH) in standardbred racehorses in Quebec. This condition, often linked to high intensity exercise, causes bleeding in the lungs.
  • A total of 60 standardbred horses aged between 3 to 10 years were included in the study.
  • The horses were endoscopically checked for EIPH an hour post their races on minimum three different occasions.
  • Additional parameters such as race timings, final rank/order, and post-race venous lactate concentrations were recorded.
  • All environmental factors, including air temperature, relative humidity, and air pollutant levels were noted on each examination day.


  • Out of 60 horses, a total of 52 (or 87%) had tested EIPH-positive at least once during three evaluations. Forty of these 52 horses displayed grade 2 EIPH.
  • Among the EIPH-positive horses, about 52% were affected three out of three times, 21% affected two times, and 27% only once.
  • During the first examination, 37 of the total 60 horses (or 62%) tested EIPH-positive.
  • It was noted that the presence or frequency of EIPH was not significantly dependent on age, sex, or gait of the horses.
  • The condition was significantly common in horses with grade 2 EIPH, who bled 83% of the time in contrast to horses with no more than grade 1 EIPH who bled 47% of the times.
  • The key parameters such as average race timings, final rank/order, and blood lactate concentrations were nearly the same for both EIPH-positive and EIPH-negative races, specifically in horses with intermittent EIPH.
  • The study also revealed a correlation between the proportion of horses displaying EIPH and certain environmental factors such as air temperature, humidity, and air pollution levels on the evaluation days.

Cite This Article

Lapointe JM, Vrins A, McCarvill E. (1994). A survey of exercise-induced pulmonary haemorrhage in Quebec standardbred racehorses. Equine Vet J, 26(6), 482-485. https://doi.org/10.1111/j.2042-3306.1994.tb04054.x


ISSN: 0425-1644
NlmUniqueID: 0173320
Country: United States
Language: English
Volume: 26
Issue: 6
Pages: 482-485

Researcher Affiliations

Lapointe, J M
  • Du00e9partement de Mu00e9decine, Facultu00e9 de Mu00e9decine Vu00e9tu00e9rinaire, Universitu00e9 de Montru00e9al, St-Hyacinthe, Quebec, Canada.
Vrins, A
    McCarvill, E

      MeSH Terms

      • Air Pollutants
      • Animals
      • Female
      • Hemorrhage / epidemiology
      • Hemorrhage / veterinary
      • Horse Diseases / epidemiology
      • Horses
      • Humidity
      • Lung Diseases / epidemiology
      • Lung Diseases / veterinary
      • Male
      • Physical Exertion / physiology
      • Prevalence
      • Quebec / epidemiology
      • Temperature


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